Kimi K3 Pretrain Capabilities Recalibrated

RyanGreenblatt · x · 2026-07-17

The author shared quick test results for Kimi K3 pretrain and later revised their initial judgment.

Key points:

Initially, they estimated Kimi K3's pretrain capabilities to be close to, or even slightly higher than, Opus 4.8;
Upon re-testing, they felt this was too optimistic;
The new conclusion is that Kimi K3's pretrain is roughly between Opus 4 and Opus 4.5, lagging behind Anthropic by about 8 to 10 months;
They also caution that such tests are better at measuring general pretrain capabilities and may not fully reflect code data quality.

Overall, this is a measured correction of model capabilities rather than simple benchmark chasing.

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